Transflective Blue Phase Liquid Crystal Display Using Double-side Etching Electrodes with Different Transflective Ratio

• Main Authors: Yu-Hao Chen, 陳宇豪
• Other Authors: 蔡永傑
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4cn23u

碩士 === 國立臺灣大學 === 光電工程學研究所 === 107 === Liquid crystal display has been a mainstream display technology and it could be seen everywhere in our life. Blue phase liquid crystal (BPLC) has potential for next-generation display technology. BPLC doesn’t need alignment layer and it also has sub-millisecond fast response time. These properties make BPLC very attractive. However, BPLC has some problems such as high operation voltage and low transmittance. In this thesis, we will improve these problems by proposing new structure designs for BPLC displays. In this thesis, we referenced two concepts. One is the etching substrate, which was proposed by Prof S.T Wu’s group in 2010. The other one is the double-side electrodes, which was proposed by Hebei University of Technology in 2011. With these two methods, we could improve problems of high operation voltage and low transmittance. After detailed analyses and discussions, we had some conclusions for these devices. In these designs, the transflective device is particular attractive. In order to use transflective LCDs more widely, we made different discussions according to the ratio between the transmissive area and the reflective area. After optimizing the data, we got a transmissive device which had high optical efficiency of about 93.5% at 13V. On the other hand, the new transflective design had optical efficiency of > 90% at 10.4V. The results all show good improvement for PSBP LCDs. There are some issues that need to be addressed, e.g. the fabrication difficulty, defect of performance, etc. All of them will be discussed in this thesis.